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Tag: Optical

Power Requirements for He-Ne Lasers

Power for a He-Ne laser is provided by a special high voltage power supply and consists of two parts (these maximum values depend on tube size – a typical 1 to 10 mW tube is assumed): Operating voltage of 1,000 to 3,000v DC at 3 to 8mA.Like most low current

Continue readingPower Requirements for He-Ne Lasers

Cat Links Randoms, Teardown

Sky+ HD Set Top Box

Posted on August 1, 2016July 21, 2016 The Engineer

Time for another teardown! I managed to fish this Sky+ box out of a skip, but to protect the guilty, all serial numbers have been removed. These are pretty smart devices, with DVR capability on board. There’s a lot of ports on these units, from RS-232 serial, POTS modem, eSATA,

Continue readingSky+ HD Set Top Box

Cat Links Personal Project, Randoms

AVR Optical Tachometer

Posted on June 17, 2013 The Engineer

Here is an AVR powered optical tachometer design, that I adapted from the schematic found here. I made a couple of changes to the circuit & designed a PCB & power supply module to be built in. The original design specified a surface mount IR LED/Photodiode pair, however my adjustment

Continue readingAVR Optical Tachometer

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  • Helium Neon Lasers
    • He-Ne Lasers – Introduction
    • Applications of a 1mW Helium-Neon Laser
    • He-Ne Laser Safety
      • Laser Safety Classifications
    • Theory of Operation, Modes, Coherence Length
    • He-Ne Laser Tubes, Heads, Structure, Power Requirements, Lifetime
    • Power Requirements for He-Ne Lasers
      • Modular He-Ne Laser Power Supply
    • Wavelengths, Beam Characteristics
    • Magnets in High Power or Precision He-Ne Laser Heads
    • Internal Mirror He-Ne Tubes up to 35 mW – Red and Other Colours
    • Viewing Spectral Lines in Discharge, Other Colours in Output
    • Demonstration He-Ne Lasers, Weatherproofing
    • Interesting, Strange, and Unidentified He-Ne Lasers

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